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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster III

Q 55.7: Poster

Donnerstag, 5. März 2009, 16:30–19:00, VMP 8 Foyer

Delbrück scattering in combined Coulomb and laser fields and vacuum polarization effects in a plasma — •Ben King, Antonino Di Piazza, and Christoph H. Keitel — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

Delbrück scattering is the scattering of a high-energy photon by the Coulomb field of a nucleus. It is one of the few effects of quantum vacuum polarization that has been measured experimentally. We study here how the presence of a strong laser field modifies the cross-section of Delbrück scattering and find a relevant enhancement at small scattering angles [1]. In addition, the total cross section is (logarithmically) enhanced with respect to that of pure Delbrück scattering. Finally, based on our previous paper [2], we present preliminary considerations on vacuum polarization effects induced by a strong laser field in a plasma at finite temperature [3].
[1] A. Di Piazza and A. I. Milstein, Phys. Rev. A 77, 042102 (2008).
[2] A. Di Piazza, K. Z. Hatsagortsyan, and C. H. Keitel, Phys. Plasmas 14, 032102 (2007).
[3] B. King, A. Di Piazza, and C. H. Keitel, in preparation.